<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        function Person() {

        }
        var person = new Person();
        person.name = 'Kevin';
        console.log(person.name) // Kevin
        console.log(person);
        console.log(person.__proto__);
        console.log(Person.prototype.name);
    </script>
</body>

</html>